Exam 4: Ch 26 Reproductive System Flashcards
Primary sex organs (Gonads) functions
Both produce gametes and secrete sex hormones
Males: testes
females: ovaries
Secondary sex Organs in females
uterine tubes, uterus, and vagina
secondary sex organs in males
spermatic duct system: (epididymis, ductus deferens, ejaculatory duct, and urethra)
accessory sex glands: ( seminal vesicles, prostate, and bulbourethral glands)
What classifies a secondary sex organ
any organ required for reproduction besides the primary sex organs
What are testes
primary sex organ that secretes testosterone and is the site of spermatogenesis
Where do testes develop
abdominal cavity
When do testes descend into scrotum
2 months before birth
What is the scrotum
external pouch, divided into left and right pouches by median septum which helps prevent infection
What divides the right and left compartments of the scrotum
median septum
Perineal raphe
external seam which marks the median septum
Spermatic cord
nerves, blood and lymphatic vessels, fibrous connective tissue, and ductus deferens
What pulls the testes closer to body when cold
Cremaster muscle and Dartos muscle
What muscle contracts to pull the testes closer and is continuous with the internal oblique
Cremaster muscle
What muscle contracts to pull the testes closer and wrinkles the scrotum
Dartos muscle
Testicular venous plexus that surrounds testicular artery and spermatic cord and acts as a counter-current heat exchange
Pampiniform plexus
Outpocket of peritoneum of testes and forms during descent of testes
Tunica vaginalis
Dense, white fibrous capsule deep to the tunica vaginalis and divides the testes into 200 to 300 lobules
Tunica albuginea
Thickened posterior region of this forms the mediastinum testis
tunica albuginea
site of spermatogenesis within the testes. 2 to 3 highly coiled seminiferous tubules located in each lobule
Seminiferous tubules
Short tubules that transport sperm from the seminiferous tubules to the efferent ducts. located in the mediastinum testis
rate testes
short tubules that transport sperm from the posterior surface of the testes to the epididymis. Epithelium contains ciliated cells
Efferent ductules
Located of the posterior surface of the testes. Sperm storage and maturation site. Defective sperm are absorbed here.
Epididymis
What are the regions of the epididymis
3
Head, body, tail
This organ functions in rapid sperm transport during ejaculation. Uses smooth muscle contractions
Ductus deferens
How long is the ductus deferens
45 cm
Ampulla
dilated distal region of ductus deferens
Formed by the union of the ductus deferens and seminal vesicle. functions in rapid sperm transport during ejaculation
Ejaculatory duct
What does the ejaculatory duct pass through and empty into
passes through the prostate and empties into the urethra
Length of urethra
20 cm
What is the role of the urethra
rapid sperm transport during ejaculation
What are the three regions of the urethra
Prostatic, membranous, and spongy (penile)
How is urine prevented during ejaculation
contraction of the internal urethral sphincter
What are the characteristics and functions of accessory sex glands in males
They add secretions to the male duct system and sperm do not pass through them
How much volume does seminal vesicles add to semen
70%